Internal combustion engine



April 4, w33- ll.. M. wooLsoN 1,903,4l2

INTERNAL COMBUSTON ENGINE 2 Sheets-Sheet 1 Filed Oct. 25, 1930 mmm/AW.

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PY4, 1933- l.. M. wooLsoN lLQOLMZ INTERNAL COMBUSTION ENG/INE FiledOct.25, i350 2 Sheets-Sheet 2 Patented Apr. 4, 1933 UNTE STATES maar FATNT@FFE LIONEL M. WOOLSON, DECEASED, LATE 0F DETROIT, MICHIGAN, BY EMMA F.WOOLSON, EXECUTRIX, OF BLOOMFIELD VILLAGE, MICHIGAN, ASSIGNOR TO PACKARDMOTOR CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGANINTERNAL COMBUSTION ENGINE Application led October 25, 1930. .Serial No.491,255.

This invention relates to internal combustion engines and moreparticularly to pumping mechanism for engine lubricating systems.

An object of the invention is to provide a novel and improved form ofpumping mechanism for internal combustion engines.

Another object of the invention is to provide pumping mechanism for alubricating system of an internal combustion engine in which there is acirculating pump for moving lubricant through the engine and two suctionpumps for moving lubricant to a reservoir through a cooler.

A further object of the invention is to provide a unitary pumporganization for the lubricating system of an internal combustion enginewhich consists of a plurality of pumps driven from ay common shaft andhaving chambers connected in a novel manner.

These and other objects of the invention will appear from the followingdescription taken in connection with the drawings, which form a part ofthis specification, and in which:

Fig. 1 is an end view of the pump assembl 5Fig. 2 is a sectional view ofthe same taken on line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken on line 3 3 of Fig. 2, showing thesuction pump;

Fig. 4 is a sectional view taken on line 4 4 of Fig. 2, showing theshunting pump;

Fig. 5 is a sectional view taken on line 5-5 of Fig. 2, showing thepressure pump;

Fig. 6 is a fragmentary sectional view` of the pump mechanism taken online 6-6 of Fig. 3;

Fig. 7 is a sectional view taken on line 7 -7 of Fig. 1;

Fig. 8 is a diagrammatic view of the lubricating system associated withan engine.-

This invention has todo with the pump mechanism per se which isassociated in a system of the character set forth an:1 covered in hisco-pending application Serial No. 441,390,

c ludes a lubricant reservoir 11, a cooler 12 and Ua pump mechanismindicated generally at 13. There is a'pressure pump mechanism 14 formoving lubricant from l the reservoir into suitable ducts formed in theengine (not shown) and leading to points to be lubricated; there is asuction pump indicated generally at 15 for movingcollected excesslubricant from the engine through the cooler to the reservoir, and aseccircuit so that when it becomes overloaded eX- cess lubricant willpass directly to the return line leading to the cooler and reservoir.The suction pump 16 and its connection 18 lead directly to the returnline and are provided so that lubricant can be moved directly into thereservoir from the return line and the cooler for the purpose ofreducing the temperature of the lubricant in the return line andmaintaining the return line completely filled with lubricant so that amaximum heat transfer will take place through a full Volume capacityflow in the cooler.

In order to move lubricant in a system in the manner above described,there is provided a novel and improved pumping mechanism which consistsgenerally of a plurality of sections associated to provide an eficientcompact structure which can be readily associated with the engine casingand driven from the interior thereof. The end wall 20 of a casing 21abuts against the rear cover 22 of the engine and is closed by apartition Wall 23 to form a chamber for the suction mechanism whichmoves lubricant from theengine lto the cooler and reservoir. Anothercasing 24 is arranged in alignment with an intermediate casing 25 and apartition 26 divides such chamber casing is provided with an open encasings while an open end of the casing abuts against the partition 23.The casing 24 provides a feeding chamber while the casmg 25 provides achamber for the vauxiliary umpmechanism. It will beseen that the tchambers are arranged in ali ent and a plurality of bolts 27 extend trough the casings and engage the end wall of the engine to secure thecomposite pump housing structure thereto.

The casing 21 is provided with'a guide flange 28 which extends into anopening in the engineend wall and pilots the structure relative thereto.A shaft 29 extends axially through the pump casing structure from theinterior of the crank case and is rovided on its interior end with agear 30 a' apted to be driven from the crank shaft in any conventionalmanner. A shaft 31 extends through the pum casing structure in aparallelrelationwi the driven shaft 29 and gears 32, 33 and 34 areloosely mounted upon such shaft. The gear 32 is arranged within thesuction return chamber, the gear 33 is in the auxiliary shuntin chamber,while the gear 34 is in the pressure ceding chamber. Keyedto the shaft29 are gears 35, 36 and 37, the gear 35 being in the suction returnchamber and meshing with the gear' 32, the gear 36 being in theauxiliary shunting chamber and meshing with ear 33 while the gear 37 isin thepressure ceding chamber and meshes with the gear 34. It will thusbe seen that within each of the three casings there is al pair ofmeshing gears which form a pump structure for circulating the lubricanttherethrough.

The outer tend of the pressure feedin axial extension 38, the end ofwhich is closed b a cap 39 which is fastened by a nut 40 w ich isscrewed upon a stud 41 fixed to the pressure casing 24. The ca 39 has ac 1indrical screen 42 fixed to the inner face t ereof and such screen isof substantially the same diameter as the chamber formed by theextension 39. A conduit 43 is screwed into an o ning 44 in the -end wallof the casing 24 w ich ortion thereof projects from thecylindricafextension and serves as `an inlet rfor lubricant entering thepumpstructure from the reservoir 11. Lubricant entering the pressurefeeding chamber from the conduit 43 must pass t rough the screen 42 andan opening indicated at 45 in the interior wall 46 of the casing 24. Thegears 37 and 34 draw lubricant from the reservoir through v the conduit43 into the pressure feeding chamber within the'casing 24 and 'move itunder pressure through an outlet 47 in the partition wall 26, through anaperture 48 in the casing 25 and an aperture 49 in the suction casingwhich leads to an outlet duct 50 with which a conduit 51 is secured.Itwill be understood that the o enings 47, 48 and 05 49 are in alignmentan that there is an f aligned opening in the partition 23 so that anenclosed passage-way is thus formed to extend from the pressure chamberto the outlet chamber 50 in the suction return casing, and thatlubricant will be forced through such passage-way and the conduit 51 toa suitable conduit system interiorly of the engine and leading to pointsto be lubricated therein.

The partition 26 is also formed with an aperture 52 which leads into thechamber .formed by the casing 25 so that the pair of gears therein willdraw a portion of the oil entering the pressure chamber into theauxiliary shunting chamber from which it is moved under pressure to thereturn line 53 through the opening 54 in the partition 23 which leadsinto' the outlet end 55 of the suction return chamber, the return line53 being secured in the -opening 54 formed in the wall of the casing 21.

The pair of gears 32 and 35 are arranged within the suction returnchamber and draw excess lubricant which is collected in the envthereservoir through the shunting chamber and that returnin from the enginepasses into the return con uit and is forced through the cooler and theconduit 58 back into the reservoir 11. In order to accommodate thequantity of lubricant which is moved through both the suction return andshunting chambers, the conduit 53 is formed of adequate cross-Sectionaldiameter. It will also be seen that lubricant isshunted through thepresthere is a valve 60 which is slidably mounted in an o enin 61 formedin the casing 25 and norma y he d in closed `position by a coil spring62, the tension of which vis regulated by the cap 63 which is screwedinto the casing openin 61 and can be adjusted axially as may be e'sired.It will be seen that the valve normally maintains thel passage 59 closedbut when a predetermined pressure is present in the conduit leading fromthe pressure chamber to the\engine, then such pressure will force thevalve opemagainst the tension of the spring 62 so that it Will'flow intothe outlet portion of the suction return chamber and thus relieve thepressure in the feed line the desired amount.

Through the organization of the three pumps herein described. there isprovided a unitary compact structure which can be readily associatedWith or removed from the rear cover of the engine casing. It will alsobe seen that the composite pump structure herein described provides forinterior connections so that the use of tubing and connections is notrequired, thus the possibility of external leakage is materiallyminimized.

lVhile there is herein described in some detail a specific embodiment ofthe invention, which is deemed to be new and advantageous and may bespecifically claimed, it is not desired to have it understood that theinvention is limited to the eXact details of the construction, as itwill .be apparent that changes may be made therein Without departingfrom the spirit or scope of the invention.

What is claimed is:

1. In a lubricating system for engines, a pump structure comprisingthree aligned casings providing chambers, a pair of parallel shaftsextending through the chambers, one of said shafts-being driven, a pairof meshing pump gears in each chamber mounted on the shafts, the gear onthe driven shaft being fixed thereto, conduit means connecting thefeeding chambers With the engine lubricating ducts and with a source oflubricant supply, conduit means connecting the outlet chamber With theoutlet end of the engine lubrieating duct means and the source oflubricant supply, and means connecting the third 1cthamber with thefeeding and outlet chamers.

2. In a lubricating system for engines, a pump structure comprising acasing forming a feeding chamber, an outlet chamber and shunt chamber, apair of pump gears in each,

chamber, means for driving a gearof each pair of gears when the engineis operating, and duct means connecting the shunt chamber With the inletportion ofthe feeding vchamber and the outlet portion of the outletchamber.

3. In a lubricating system for engines, a pump structure comprisingfeeding pump means for moving lubricant from a reservoir to the engineparts to be lubricated, suction pump means for returning lubricant fromthe engine to the reservoir, and pump means for means to the suctionpump means. 4. In a lubricating system for engines, a

pump structure comprising a casing divided let chambers, and pump meansin each of the chambers.

5. In a lubricating system for engines, a pump structure comprising acasing divided to provide an inlet chamber, a' feeding chamber and anoutlet chamber, pump gears in the chambers, relief duct meansvconnecting the discharge side of the inlet chamber with the dischargeside of the outlet chamber, and a pressure actuated valve in the reliefduct.

6. In a lubricating system for engines, a pump structure comprising asection casing providing a feeding chamber and an outlet chamber, pumpgears in the chambers, a feeding duct extending through the casing fromthe feeding chamber, a connecting duct leading from the feeding duct tothe outlet portion of-the outlet chamber, and a pressure relief valve inthe connecting duct opened by .pump structure comprising a casingdivided to provide a feeding chamber and an outlet chamber, pump meansin the chambers, and duct means in the casing connecting the inlet sideof the feeding chamber with the discharge side of the outlet chamber.

8. In a lubricating system for engines, a pumpl structure comprising acasing divided to provide a feeding chamber and an outlet chamber, pumpmeans in the chambers, duct means in the casing connecting the inletside of the feeding chamber with the discharge side of the outletchamber, and pump means in the duct means.

.In testimony whereof, have hereunto subscribed my narfle this'24th dayof October,

'Emea/whim of the Estate of Lionel M. Woolson, Deceased.

Vshunting lubricant from the feeding` pump

